Question about 2004 Hyundai XG350

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Check engine light comes on after driving got new gas cap engine light goes off then comes back on and the gas cap keeps loosening itself what is going on.

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  • 60 Answers

I would take it back and try another one before trying any other fixes.

Posted on Oct 22, 2013

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6 Suggested Answers

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Posted on Jan 02, 2017

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  • 10 Answers

SOURCE: Check Engine Light is On 2006 Hyundai Elantra 13,000 miles

An easy fix, if the check engine light is on find an Auto Advance, they can clear the code for you. Any auto parts store may be able to as well, Auto Zone is another one that may be able to help.

Posted on Nov 22, 2008

ghost45
  • 1280 Answers

SOURCE: fluctuating engine temp a/c sends out cold air intermittently

Here's the thing. The ECU will shut down AC if the engine temperature is too hot. If the coolant temperature sensor is malfunctioning (lying to the ECU) telling it that the temperature is hotter than it actually is, the computer will turn the AC OFF.

Posted on Sep 12, 2009

  • 7353 Answers

SOURCE: check engine light comes on every time I get into high altitude

we need a trouble code to at least where to start helping you. one thing that is vital is a BARO reading of your location(call the local airport, should be approx 29-30) and the BARO PID reading of your truck,it should read approx 155-156 ....if it reads like 140 the MAF sensor will need to be replaced.

Posted on Sep 25, 2009

gh20s
  • 343 Answers

SOURCE: 2001 Hyundai Elantra

The turn signal switch is grounding out somewhere which is probably at the switch and may need to be replaced. That is laziness on the dealers part for not checking the obvious. Tighten the gas cap completely and drive the car 40 to 50 miles and if the system is sealed, the light should go away. Please rate me on this answer.

Posted on Jun 08, 2010

Testimonial: "Thank you for your quick answer! I appreciate it. I'll see what happens after 40-50 miles. I'll tell the dealer the next time it goes in to check the switch. Thanks again! "

c1apton15
  • 3400 Answers

SOURCE: Check engine light came on 2005 Hyundai Elantra

Yep. As silly as it sounds, that's correct.

Posted on Jan 07, 2011

Testimonial: "Seems very knowledgeable. Prompt feedback."

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1 Answer

My check engine and check fuel cap light keep coming on after i changed the gas cap twice and reset the light it came back on what could this be. I drive a 06 lincoln navigator


You need to diagnose any codes you get
& smoke test the evap system, to find a
problem

Seldom does throwing on parts with a name similar
to a code work

Codes have nothing to do with installing parts

Clearing codes, clears all data needed to diagnose
the failed system & the evap system only runs every few
days,so you done as far as codes helping

Mar 22, 2014 | 2006 Lincoln Navigator

1 Answer

Check engine light stays on


The 'check engine' light comes on when almost anything goes wrong, from a loose gas cap to computer systems; low fluid levels to a bad catalytic converter. A common problem is the gas cap not screwed on correctly. This has an easy remedy. Screw the cap off and then carefully seat it and screw it back on until you hear it click. Then drive the car for at least 100 miles. If the light goes out that was the problem.
If the light stays on then you must take it in to be checked by special equipment because that is the only way to isolate the problem.
In my own experience of the light coming on 3 times, there were 3 different reasons: 1) loose gas cap, 2) bad catalytic converter needed replacing [the most expensive unless under warranty] and 3) a bad gas cap that needed replacing. After all 3 instances, the light went out.
I hope it's only a gas cap issue for you. Good luck.

May 24, 2012 | 2005 GMC Envoy

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Some body stolen the fuel gas cap frome my car,i drive 2 day w/out cap.when i see that im buy new gas cap,but tha chek engine come in on,what can i do to solve this problem?thanks


One of the problems that trigger a check engine light is either a faulty gas cap, gas cap not on all the way or no gas cap. Once you replace the gas cap you should be able to reset your check engine light or it may automatically adjust itself.

Feb 15, 2011 | Chevrolet Camaro Cars & Trucks

1 Answer

2002 Stratus check engine light came on. Code said it has something to do with possibly the gas cap so I replaced it and had the light reset. It came back on. Also, I notice the fuel system does not seem...


I have a 2002 Dodge Ram and i have the same problem with my check engine light coming on because of the Fuel Cap. Most likely it is the sensor itself that needs to be replaced because i have done the same thing as you and replaced the cap.. Sometimes it shuts itself off after i fuel up but a couple days later it will come on again.

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The engine light comes on. When the gas tank is


Most likely an EVAP code. Need to scan it to get the specifics.

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2007 GMC Envoy - Gas gauge showing empty and check engine light


This is a safety feature that the vehicle brings. You need to reset the E.C.U on dealership or it will keep doing it to you. It was probably caused by one single time that you did not closed the fuel cap correctly. Good luck

Dec 29, 2009 | 2007 GMC Envoy Denali

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I think someone loosened my gas cap on my 07 silverado, would like to know if there is a way to reset engine light.


Once you tighten the gas cap the engine light will reset itself after it has gone threw the necessary drive cycles, but only if the problem has been fixed. So yes if the check engine light came on for the reason of a loose gas cap, once you tighten it it will go off on its own.

Nov 11, 2009 | 2007 Chevrolet Silverado 1500 2WD

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Gas Cap Error with Check Engine light


By "Replace the gas cap", do you mean put it back on, or buy another one? If you fuel these trucks with the engine running, or don't tighten the gas cap, the light will come on. It will also come on when the seal in your gas cap goes bad. I have had to replace the gas cap on my jeep and dodge already. It fixed the problem both times.

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Check engine light on. Code P0440.


wow thermostat >>>> shucks i believe its evep emissions code like faulty gas cap ....you can reset any computer the chck eng light will come on in 50 to 100 miles if not fixed....

May 07, 2009 | 2001 Buick Regal

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